Puppet Enterprise Installer - Validating page stuck

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I am trying to install puppet-enterprise-2016.1.2-ubuntu-14.04-amd64.tar on ubuntu 14.04. I get till gui mode . I open that URL with 3000 port and select monothilic and on to same server. I fill FQDN name and consol admin pwd the click submit. Then i get till Puppet Enterprise Installer - Validating page...after that nothing is displaying.looks its stuck..the page should display :validating RAM,memory etc....but not shows any details.... it shows this only on this page till evening

View the answer files we've just
generated

master.puppet.vm 

You can find the installer answer file
'/opt/puppetlabs/puppet/share/installer/answers'
on
ec2-35-163-72-135.us-west-2.compute.a...,
but note that this answer file is
overwritten each time you run the
installer.